In the US you can marry at 12 but can't drink beer until 21. Keri met Paul, 24, at a party on her 15th birthday. They slept together just once - and Keri became pregnant. Paul asked her to marry him so that he didn’t go to jail for statutory rape. Her father's consent was needed; he gave it. Keri couldn’t finish school, and later described her marriage as horrible, with Paul treating her ‘like a maid’. Making even small legal changes on this issue is a slow, hard-won process. On 29 January, the senate in South Carolina passed a bill to end child marriage. 17 American states still have no legal minimum age for marriage if a child is pregnant and has consent from a judge or family member. So 12-year-olds continue to be legally wed to men much older than they are - if they’re pregnant.